Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-10-06
2002-09-03
Delcotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S235000, C510S421000, C510S422000, C510S423000, C510S426000, C510S427000, C510S428000, C510S433000, C510S499000, C206S524100
Reexamination Certificate
active
06444631
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a dishwashing detergent product having a ultraviolet (UV) light resistant bottle in which a dishwashing composition is contained. More specifically, the invention is directed to a dishwashing detergent product for hand dishwashing which includes a UV light resistant bottle and a dishwashing composition containing a low molecular weight organic diamines that are especially effective on grease cleaning but susceptible to discoloration upon subject to UV light. The detergent composition of this invention can be in any form, including granular, paste, gel or liquid.
BACKGROUND OF THE INVENTION
Typical commercial hand dishwashing compositions incorporate divalent ions (Mg, Ca) to ensure adequate grease performance in soft water. However, the presence of divalent ions in formulas containing anionic, nonionic, or additional surfactants (e.g., alkyl dimethyl amine oxide, alkyl ethoxylate, alkanoyl glucose amide, alkyl betaines) leads to slower rates of product mixing with water (and hence poor flash foam), poor rinsing, and poor low temperature stability properties. Moreover, preparation of stable dishwashing detergents containing Ca/Mg is very difficult due to the precipitation issues associated with Ca and Mg as pH increases.
In the past, diacid salts of diamines have been employed in dishwashing detergent compositions. Under these conditions, these materials have several limitations, one of which is that the cleaning benefits are confined to relatively low hardness (<70 ppm) levels. The prior art also suggests use of a C
2
spacer, e.g., ethylene diamine diacid salt and ethoxylated diamines, both of which severely limit performance. It has been determined that the use of certain organic diamines, as outlined in detail below, with surfactants in dishcare compositions with pH's on the order of 8 to 12 (as measured at 10% solution) leads to improved cleaning of tough food stains and removal of grease/oil when compared to the use of Mg or Ca ions in conventional detergent compositions. Unexpectedly, these organic diamines also improve suds stability in the presence of soils, especially soils containing fatty acids and proteins. Further, the strong grease removal performance of the diamines discussed herein allows reduction/elimination of Mg/Ca ions from the formulation while maintaining benefits in grease performance. The removal of Mg/Ca additionally leads to improved benefits in dissolution, rinsing and low temperature product stability.
The diamines used in this invention in combination with surfactants also provide sensory benefits. It has been found that the presence of this composition produces a “silky” feel to wash liquor and a feeling of “mildness” to the skin. The diamines are also found to produce antibacterial benefits to the wash liquor. However, the specific compositions presented herein are especially designed for dishwashing having relatively high pH levels, detersive surfactants, and optional enzymes, all of which would be undesirable in contact lens cleaners. It has also been found these benefits are achieved through the use of low molecular weight organic diamines in higher pH formulations (8 to 12) across a broad range of hardness levels (8 to 1,000 ppm or higher).
One major problem, however, associated with dishwashing detergent compositions containing such diamines is that there is a tendency for such compositions to change color upon exposure to UV light, for example sunlight. Frequently, if not inevitably, dishwashing products will be subjected to UV light (e.g., sunlight) repeatedly and over extended periods of time prior to use by the consumer. The formulations of typical hand dishwashing products are specifically tailored to a color that has been proven to be aesthetically pleasing to consumers. Any change in the target formulation color, especially when clear or translucent bottle or other packaging container is used, can negatively impact the consumer's perception of the quality of the product, and moreover, in fact lead to lower cleaning performance resulting form an incidental degradation of the diamine active in the formulation. It would therefore be desirable to have a dishwashing product contain a diamine formulation which is not significantly altered by UV light.
Accordingly, despite the above-mentioned disclosures in the art, it would desirable to have a dishwashing product which has superior performance in addition to packaging appearance that is maintained until the consumer has disposed of the product. In that regard, a specific desirable feature would be to have such a dishwashing product which is not significantly altered upon exposure to UV light.
SUMMARY OF THE INVENTION
The invention meets the needs identified above by providing a dishwashing product containing a diamine-containing detergent composition specifically for hand dishwashing which has improved grease removal performance, sudsing benefits, improved low temperature stability properties, superior dissolution, as well as improved tough food stain removal and antibacterial properties. Most importantly, the container or bottle in which the aforementioned detergent composition is contained is effectively resistant to UV light, thereby preventing any discoloration of the composition prior to full use of the product by the consumer. Alternatively, the composition itself may contain a UV light blocker rather than the container.
In accordance with one aspect of the invention, an improved dishwashing detergent product is provided. The detergent product comprises an enclosed container in which a detergent composition is contained. The container has a reclosable opening through which the detergent composition can be dispensed. The container has walls containing an effective amount of an ultraviolet light blocker to substantially retard ultraviolet light from the detergent composition in the container. The detergent composition includes a) an effective amount of low molecular weight organic diamine having a pK1 and a pK2, wherein the pK1 and the pK2 of the diamine are both in the range of from about 8.0 to about 11.5; and b) an effective amount of detersive surfactant; wherein the pH is from about 8 to about 12.
Accordingly, the invention advantageously provides a dishwashing product having superior performance in addition to packaging appearance that is maintained until the consumer has disposed of the product. Also, the invention advantageously includes a specific desirable feature in that the dishwashing product is not significantly altered upon exposure to UV light.
All parts, percentages and ratios used herein are expressed as percent weight unless otherwise specified. All documents cited are, in relevant part, incorporated herein by reference.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention essentially comprises a dishwashing detergent composition and a container which blocks, retards, or otherwise inhibits UV light such that the uniquely formulated detergent composition retains the target color. Heretofore, specially selected diamines were not formulated into dishwashing compositions as contemplated herein, and the problem of discoloration has not been recognized or addressed. The ordinary skilled formulator would have not predicted such a problem, nor recognized the solution as described herein. The container, which can be a bottle made of high density polyethylene or the like, includes a UV light blocker as described in detail hereinafter. As used herein, the phrase “UV blocker” means any material which is capable of blocking, reflecting, inhibiting a sufficient amount UV light to protect the detergent composition from deleterious effects of the UV light. The amount of UV light “blocking” will thus vary with the formulation of the dishwashing detergent composition in the container. The UV light blocker is preferably present in the container, or alternatively in the detergent composition itself, at an “effective amount” which will vary dramatically depending upon the size of the container. Typically amo
Kordenbrock Robert Henry
Ofosu-Asante Kofi
Owens Robert
Delcotto Gregory
The Procter & Gamble & Company
Waugh Kevin L.
LandOfFree
Dishwashing detergent product having a ultraviolet light... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dishwashing detergent product having a ultraviolet light..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dishwashing detergent product having a ultraviolet light... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2851138